url shortener
http://wiki.soippo.edu.ua/index.php?title=%D0%9A%D0%BE%D1%80%D0%B8%D1%81%D1%82%D1%83%D0%B2%D0%B0%D1%87:S1lombg479
URL shorteners make sharing long links more workable. The leading use case for shortened URLs is to develop variations of a single link, so you can quickly track the source of your inbound traffic